Grinder attachment for lathes.



No. 634,232. Patented Oct. 3, i899. H. DUCK.

GRINDER ATTACHMENT FDR LATHES.

' (Application led June 2 1899.) (no Model.) 2 sheets-sheet l.

N0. 634,232. Patented 001. 3', i899. I H. DUCK.

GRINDEB ATTACHMENT F08 xLATHES.

(Aplication led .Tune 2, 1899.)

2 Sheets-Sheet 2l (N0 Model.)

UNITED STATESv PATENT ritten@ HERMAN DOCK, OF PHILADELPHIA, PENNSYLVANIA.

GRINDER ATTACHMENT FOR LATHES.

SPECIFICATION forming part of Letters Patent No. 634,232, dated October 3, 1899.

` Application filed June 2, 1899. Serial Noi 719,075. ltNo model.)

To @ZZ whom, it may concern.-

Be it known that I, HERMAN DOCK, of Philadelphia,county of Philadelphia, State of Pen nsylvania, have invented an Improvement in Grinder Attachments for Lathes, of which the following description, in connection with the accompanying drawings, is a specification,A like letters and figures on the drawings rep-- resenting like parts.

This invention relates to a center-grinding attachment for that class of metal-working or similar machines containing tapered or beveled centers, between which the work is supported; and the object of the invention is to provide a simple, convenient, and compact appliance of the character specified which can be quickly mounted and dismounted and accurately leveled and which will correctly grind or true the beveled or tapered working ends of the centers of spindles of a lathe or analogous machine to which the attachment is connected, and hereinafter where I employ the word lathe I intend to include generically under the same all kinds of machinery to which the improved device is applicable.

My improved center-grinding attachment includes a driver,two power-transmitting proj ections coperating with said driver and with a power-applying device, such as the faceplate of a lathe, a grinding-tool disposed between said two projections, and operative connections between the driver and the grinding-tool for rotating the latter. The spindle which supports the grinding-tool has in addition to its rotative movement a sliding movement in its bearing, whereby it can be moved back and forth in contact with the angular surface of the center for truing the same.

As before stated, I prefer to utilize the faceplate of the lathe as a power-applying factor, and the projections to which I have referred enter two slots in the face-plate, and said projections extend approximately perpendicularly from a driver constituting a part of the attachment, and the tool, usually in the form of an emery-disk,is located intermediate these two projections, which ordinarily are the arms of a yoke which is loosely connected with one face of the driver.

The attachment has atitsopposite ends projections, in which are formed sockets to receive the two centers, and these projections are eccentrically disposed to the axis of the driver, from which it will be apparent that the projections on the driver will have a slid-l ing movement in contact with the walls of the lslot in which they remain at all times and consequently impart an even and uniform motion. The spindle which carries the grinding-tool is supported by a hollow journal or bushing ,projecting obllquely through a hub of the attachment, and this organization produces fa compact, easily-formed, and inexpensive structure.

Figure l is a plan view of a lathe of wellknown form equipped with a center-grinding attachment constructed in accordance with my invention, the parts being drawn on a reduced scale. Fig. 2 is a similar view of the attachment disconnected from the lathe. Fig. 3 is a side elevation of the same. Fig. 4 is a longitudinal central section of the support for the grinding-tool spindle, a portion of said spindle being broken away to illustrate a simple manner of keying the spindle. Fig. 5 is a detail view showing the manner of connecting the attachment with the face-plate of the lathe; and Fig. is a detail showing the hub that sustains the driver and the bar by dotted lines, through which the hollow bearing for the tool-spindle passes.

The improved attachment includes in its construction a carrier or body portion, which can be made cheaply by casting and which is represented as being of substantially triangular shape and which is denoted by 2.

VThis bodyportion or carrier is represented as having. upon one side thereof the hub or support 3 (see Figs. 4 and 6) for a driver, as 4t,

said driver being held against lateral movement on the hub or. journal 3 by means of the annular flange 5 at the inner end of the hub and the disk or circular plate 6, fitting against the opposite end of said hub and held in place by means of screws or other simple devices and bored to receive the hollow journal of the tool-carrying spindle, hereinafter more particularly described.

The body portion 2 is represented as having at its opposite ends the bosses or protuberances 7, which, it will be seen upon an inspection of Fig. 3, are disposed eccentrically IOO spindles of a lathe, and the carrier is preferably supported upon the tool slide or carriage of said lathe. The carrier2 is clamped temporarily to the tool-slide S, a bolt 9 being represented for this purpose and as passing through an opening located at a convenient place in said tool-slide, the bolt being provided with the usual nut forsecu ring the carrier or body portion 2 rmly in place and serving as a pivot about which the body por tion 2 can be turned when necessary. The tool-carriage S is mounted upon the bed B of the frame for adjustment longitudinally and transversely of the said bed and is disposed between the live and dead centers L and D, respectively, of the usual type and provided with usual driving and adjusting and clamping devices, which it is unnecessary to more deiinitely describe.

The face-plate of the lathe is denoted by F, and in the present case it constitutes a convenient means for applying the necessary power to the driver of the grinding attachment for effecting the necessary rotative movement of the grinding-tool, the feed of which, however, is manually controlled.

The grinding-tool is represented as consisting of an emery-disk, and is denoted by G, and is fixed to the longitudinal spindle orarbor 10, and is supported for rotative and longitudinal movements by the hollow journal or bushing 12, iixedly seated in a diagonal bore in the body portion 2 and also in the hub or journal 3, constituting a part of the body portion, this structure being simple and capable of manufacture at a comparatively slight cost and being as well compact. The spindle 10 is supported by the hollow journal 12 for rotative and longitudinal movements and is located at such an angular position relatively to its carrier that the straight edge of the grinding-disk G will be disposed in a plane parallel with the taper desired for the center to be grooved, and by moving the spindle back and forth in its journal the proper face can be ground upon the center. The hollow journal 12 carries the sleeve 15, having the pulley 16, connected by the belt 17 with the large pulley 18, said belt being represented as being crossed, and the collar 19 surrounds said spindle and is secured to the sleeve 15 preferably by means of screws and has a key 2O fitting in the longitudinal keyway 21, formed in the spindle 10, and the keyway is of such a length that the spindle 10 can be moved backward and forward for a considerable distance during the rotation of the grinding-disk G, thereby to provide for material adjustment or change in the working position of the disk. rl`he spindle 10 is provided at the end thereof opposite to that carrying the disk G with a knob 22, loosely secured thereto, and which may be grasped by the operator or workman to reciprocate said' r' spindle.

The wheel 1S is secured to the shaft 25, supported by projecting lugs or ears on the bearing 26, carried by the post or standard 27, rising from the base or body portion 2, and while the bearing, the post, and the body portion are represented as being made separable it is obvious, of course, that they may be east in one piece. The shaft 25 also carries a pulley 2S, connected by the crossed band 29 with the driver 4, hereinbefore referred to, and it will be noticed that the driver 4 is of much larger diameter than the pulley 28 and that the pulley 18 is much larger than the pulley 16, whereby on the rotation of the driver 4 the spindle 10 will be driven at a very high rate of speed, and this construction is simple and serviceable. The inner face of the bearing 26 is mortised to receive the head of the post or standard 27, and said head is longitudinally slotted, as at 30, and the set-screw 31 is adapted to extend through the longitudinal slot 30 and to engage in a threaded opening in the adjacent face of the bearing 26, thereby to clamp said bearing firmly in place, and it will be apparent that by elevating the bearing any slack in the two bands will be taken up, and in this case the said adjustable bearing constitutes in effect a tension-regulating carrierp The base or body portion 2 of the attachment is mounted upon the tool-slide 8 of the lathe and is leveled or adjusted to the proper horizontal position by means of suitable devices, as the triangularly-disposed screws 35, in threaded engagement with and passing through the body portion and having milled heads to facilitate turning the same. The lower ends of these screws engage the upper surface of the tool-slide, and by turning them in or out of their seats the lower ends thereof can be projected below or above the under side of the body portion 2, thereby to level the latter and to secure accuracy in operation.

The power of the face-plate F of the lathe is transmitted to the operative connections, and thereby to the grinding-tool G, through the intervention of two projections, as 40, cX- tending substantially perpendicularly from the inner face of the main driver' or pulley 4 and constituting the projecting arms of a yoke 41, which is clamped to said driver. Two of the spokes of the driving-pulley 4 are widened and are provided with socketed lugs 42 to receive the cross-piece or transverse portion of the yoke 41, said cross-piece being curved around the hub or journal 3 and litting against two of the spokes of the wheelA The yoke is held in place by the clampingplates 43, secured to the lugs 42. The grinding-tool G is disposed between the driving arms or projections 40, and said arms, it will be seen, extend from the face of the wheel 4 near the periphery thereof, and they are comparatively long and project through two diametrically opposite slots in the face-plate Fl of the lathe, and one of said arms, upon an inspection of Fig. 2, will be seen as being located nearer the ccnter-reccivin g bosses or IOO IIO

'protuberances 7 than the other, and it will be evident that as said face-plate rotates it will turn the yoke, and consequently the drivingwheel 4f, and during this operation the diametrically opposite arms or projections 40 will slide in the slots of the face-plate. The ends of the arms 4t() project beyond the grinding-tool, whereby the attachment can be moved back a considerable distance and still maintain the driving engagement between the face-plate and the projections 40, and the said projections being located at diametrically opposite points serve to transmit an even motion without any tendency to vibration.

In operation the body portion or base 2 is clamped to the tool-slide S of the lathe andis leveled and adjusted by the manipulation of one or more of the adj usting-screws 35, after which the slide is fed until the live-spindle is seated in the socket in what is illustrated in Fig. l as the left-hand boss 7, after which the tail-stock is advanced until the dead-spindle is seated in the right-hand boss, it being understood that the projections or arms 40 are thrust through the radialxslots in the face-,

plate. This operation secures the attachment in proper position,with the working face of the grinding-disk located to true the livespindle. The tool-spindle is then adjusted until the inner edge of the grinding-disk Gis in contact with the base of the tapered or conical end of the centering-spindle, after which the lathe is started, and it willbe evident that the grinding-disk G will be rotated at a high rate of speed, whereby when the spindle l0 is moved back and forth by hand, the grinding-disk being in contact with the tapered surface of the live-spindle, said surface will be accurately trued.

The invention is not'limited to the precise details of construction hereinbefore set forth, for it is obvious that these may be variously modified within the scope of the claims of my invention.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

l. Inacenter-grindingattachment,adriver, two power-transmitting projections coperative with the driver, a grinding-tool disposed between said projections, and operative connections between the driver and the tool for actuating the latter.

2. In a center grinding attachment for lathes, the latter including a slotted faceplate, a driver, two power-transmitting projections extending from .said driver and disposed in two slots of the face-plate, a grinding-tool located between said projections, and operative connections between the driver and the tool for actuating the latter.

In a center-grinding attachment, a body portion adapted to be mounted upon the toolslide and provided with a hub, a rotative driver supported by said hub, av spindle, a hollow journal for the spindle supported inV part by said hub and extending diagonally therethrough, driving projections on said driver in position to be operated by a powerapplying device, and a grinding-tool disposed between said projections and fixed to said spindle.

4. In a center-grinding attachment, a body portion mounted upon a tool-slide, a driver supported by the body portion, a yoke ixed to said driver and having projecting arms engageable by a power-applying device, a spindle supported for rotative and longitudinal movements by said body portion, and disposed at an angle thereto, and provided with 4a grinding-tool and operative connections between said driver and said spindle.

5. In a center-grinding attachment, a body portion adapted to be mounted upon a toolslide and provided with a hub, a hollow journal extending through the hub angularly thereto, a spindle supported for rotative and longitudinal movements in said hollow journal and having a grindingtool, a driver mounted on said hub and provided with two diametrically opposite arms extending therefrom and between which the grinding-tool is disposed, and adapted to extend into radial slots in apower-applying member, and operative connections between the driver and grinding-tool.

G. In a center-grinding attachment, a body portion adapted to be mounted on a tool-slide and provided with a hub, a driver rotatably carried by said hub, connections between the driver and said power-applying member for operating the driver, ahollow journal extending diagonally through said hub, a spindle rotatively supported in said journal, a sleeve 1 on said spindle, a pulley on said sleeve connected by speed-m ultiplying mechanism with the driver, a collar fitted to the sleeve and having a key disposed in a longitudinal keyway in said spindle, a knob loosely secured to one end of the spindle, and a grinding-disk secured to the opposite end of said spindle.

7. In a grinding attachment, abodyportion adapted to be mounted upon a tool-slide and having a hub, a pulley supported by the hub, a post on the body portion, a shaft, a bearing for the shaft carried by the post, pulleys secured to the opposite ends of the shaft and one of them being connected to the first-mentioned pulley, a spindle rotatively and longitudinally supported by the body portion and having a pulley connected with the other pulley on said shaft, a yoke clamped to the pulley on said hub and provided with projections extending from said pulley and a grinding- IOO IIO

latter, a spindle supported by the body portion for longitudinal and rotative movements and having a grinding-tool and a driving member provided with projections, and operatively connected with the grinding-tool for rotating the latter.

l0. Inagrindingattachment,abodyportion adapted to be mounted on a tool-slide and provided with a series of angularly-disposed adjusting devices movable below the under side of the body portion, a spindle carried by and disposed angularly to the body portion andhavingagrinding-tool,anddrivingmeaus for the spindle.

l1. In agrindingattachment,a body portion adapted to be mounted upon a tool-slide and carrying a spindle provided with a grindingtool, a driver supported by the body portion for rotation, two projections disposed at diametrically opposite sides of said driver and adapted to be operated by a power-applying member, and disposed at opposite sides of the grinding-tool, operative connections between said driver and the grinding-spindle, and means for leveling said body portion on the tool-slide.

12. In a grinding attachment, a post rising from the body portion and longitudinally slotted, a bearing fitted against the body portion and provided with a shaft, a screw extending through the slot and post and in threaded engagement with the bearing, a driver carried by the body portion, a device on said shaft operatively connected with said driver, aseoond device on said shaft, a spindle disposed diagonally of the body portion and operatively connected with said second device for rotation, a grinding-disk secured to said spindle, and two proj eetions on the driver extending longitudinally therefrom and engageable by a suitable operating device.

18. grinding attachment 'for lathes, a

body portion supported bythe tool-slide and having a journal; a driver supported by said journal and connected with a power-applying member; a hollow journal extending through said first-mentioned journal; a spindle supported for rotative and longitudinal movements in said hollow journal and provided with a grinding-tool; and operative connections between said driver and the spindle for rotating the tool.

14. In a"centergrinding attachment,a driver having a plurality of projections connected' across the axis of motion of the driver and adapted to be engaged with and driven by a rotatable part of a lathe, and a grinding-tool located between said projection and movable in the hub for sustaining the driver, the spindie carrying said tool being rotated from the driver.

l5. In a center-driving attachment, a sustaining-hub having a diagonal bore, a driver supported upon the outside of the hub and having two laterally-disposed arms adapted to be engaged by a driver, and between which said hub is located, a tool-spindle extending through said bore, and connections between the driver and the spindle to rotate the latter.

1G. In a center-grindingattachment,a driver having a yoke loosely connected thereto, the arms of the yoke projecting outwardly from the driver and adapted to be engaged by a power-applying member, and a grinding-tool disposed between said arms and located to be actuated by the driver.

In testimony whereof I have signed my name to this specification in the presence of the subscribing witnesses.

HERMAN DOCK.

Witnesses:

HORACE M. RUMsnY, EDWARD J. MAGINNIs, I. IIAzLn'roN MImUL. 

